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-   -   2010 E550 cooling fan running full speed at start up (https://mbworld.org/forums/e-class-w212/709296-2010-e550-cooling-fan-running-full-speed-start-up.html)

Tmaxxman 05-31-2018 12:12 PM
2010 E550 cooling fan running full speed at start up
 
Car had been working fine until last night and the ac started blowing hot air now this morning the engine cooling fan is running wide open at start up ac is working now though

MBENZTECH 06-07-2018 09:14 PM
It sounds like you have a problem with your engine control module. They fail internally and send the wrong voltage to the fan controller, causing the fan to operate at 100%. But it could also be the fan getting the correct voltage but the controller doesn't operate the fan motor. Have to do some diagnostic before replacing parts.

thefisch 06-09-2018 04:02 PM
There is a bulletin about radiator fan issues. Check out the stick and search for fan.

Tmaxxman 08-13-2018 03:37 PM
what do you mean check out the stick

KEY08 08-13-2018 04:08 PM
The bulletin sticky notes at the top of the forum. My friend thinks everyone is hip and sometimes gets carried away.
Are you still fighting this issue after such a long time between posts??

thefisch 08-13-2018 04:30 PM
You give me too much credit. I just forgot the 'y'.

Tmaxxman 08-14-2018 12:49 PM
yes have not been driving the car due to the air ride has now quit working this is one problem after another with this car . I owned a 1999 C230 Kompressor for 11 years with not one issue I give it to my daughter and buy this and it is one issue after another

Tmaxxman 09-08-2018 02:50 PM
Where is the fan relay located


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